Screen-plate for paper-making machines.



UNITED STATES PATENT CEEICE.

RICHARD SMITH, OF SHERBROOK, CANADA.

SCREEN-PLATE FOR PAPER-MAKING MACHINES.

SPECIFICATION forming part of Letter Application filed June 30,V 1898.

To @ZZ whom it may concern:

Be it known that I, RICHARD SMITH, residing at Sherbrook, in the countyof Sherbrook, Province of Quebec, Canada, have invented a new and usefulScreen-Plate for Paper-Making Machines, of which the following is aspecification.

This invention consists in the peculiar disposition of thescreening-slots of the screenplate of a paper-making machine, by meansof which greater efficiency in the screening of the pulp is secured andthe clogging of the plate is prevented to a much greater degree thanheretofore and by means of which the screen-plate may be more thoroughlyand expeditiously cleaned. Heretofore, so far as my knowledge extends,the slots in such screen-plates have been arranged in lines parallel tothe boundaries of the plate either longitudinally or transverselythereof. -In my present invention I dispose the slots of thescreen-plate obliquely to the boundaries or body of the plate, as shownin the accompanying drawing.

I have ascertained by practical experiments that when the slots arearranged obliquely, as stated, the fibers of the pulp are less liable`to cling to the edges of such slots and much of the clogging of ascreen-plate experienced from this cause is avoided.

By the employment of the obliquely-disposed slots the cleaning of thescreen-plate can be more thoroughly done, for the reason that such ofthe fibers as adhere to the edges of the slots are gradually crowdedthrough,

S Patent NO. 671,780, dated April 9, 1901.

Serial No. 684,904. (No model.)

Whereas with the parallel slots they would remain.

Inthe accompanying drawing, which` is a plan of a screen-plate, suchplate is shown at 1 and its slots at 2 2 2, dac., such slots, as beforestated, being disposed in lines obliqnely to the boundaries or generalbody of the plate. In the present instance these slots are. arranged intwo rows at opposing angles, each occupying one-half of the plate, whichI have found to be a very effective arrangement; but they may be in onerow, extending entirely 'across the plate, or in three or more rows.

I do not confine myself to any arbitrary grouping of the slots so longas they are disposed obliquely to the boundaries or body of the plate,as it is in this feature that I consider my present invention toconsist.

' What I claim isl. A screen-plate for paper-making machines providedwith oblique open parallel slots for the purpose set forth.

2. A screen-plate for paper-making Inachines provided with two parallelseries of oblique slots, the slots of each series being parallel to eachother and reversely inclined with respect to the slots of the otherseries, substantially as set forth.

in presence of two witnesses.

RICHARD SMITH.

Witnesses:

F. CURTIS, O. H. THORNTON.

In testimony whereof I affix my signature l

